There are three hard problems in distributed systems:
2. Exactly-once message delivery
1. Message ordering
2. Exactly-once message delivery
2. Exactly-once message delivery
2. Exactly-once message delivery
2. Exactly-once message delivery
2. Exactly-once message delivery
If you have a fediverse account, you can quote this note from your own instance. Search https://mastodon.me.uk/users/mash/statuses/114445630804929402 on your instance and quote it. (Note that quoting is not supported in Mastodon.)